Answer to Question 1
In crystalline regions the polymer chains are tightly packed which results in a high density. The polymers in these crystalline regions have relatively strong intermolecular bonds which increase the stability of the polymer and increase most mechanical and physical properties. Amorphous regions are zones within the polymer structure where no crystallinity exists. Even highly crystalline polymers usually have some amorphous regions. The physical and mechanical properties for largely amorphous polymers are lower than analogous crystalline polymers.
Answer to Question 2
Small molecules have exact formulas which always apply. In polymers, the chains can be of varying length and so a general formula must be used. This general
formula represents the number of monomer units by an unknown
Answer to Question 3
The number average is dominated by the actual number of molecules and gives equal value to both large and small molecules. The weight average molecular weight gives greater value to the large, heavy molecules.
Large regions of the Boreal forest in Alberta have been divided into a grid due to industrial develo
Nine Abdominal Anatomic Regions
Open palmar friction moving back and forth over the lumbar and thoracic regions.
Phrenology model showing areas of the head overlaying brain regions that control different traits. I
Major bone (tan) and cartilage (light blue) elements of the human skeleton. Inset shows regions of v
Functional Regions of the Human Brain